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How can I quickly diagnose hardware on a Mac?

I'm buying a second-hand iMac tomorrow and the guy's coming to my house to complete the deal. As is standard, I'd like to check the system and make sure it all works properly before buying. Is ...
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External Drive Having Issues… Best Diagnostic Hard Drive Checking Tool for OS X Lion?

I have a WD Elements drive that I use for Time Machine backups, I used Disk Utility to verify the disk, it found errors and I tried repairing it, which failed, so I reformatted the drive and it ...
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Essential Macintosh Tools [duplicate]

Possible Duplicate: What are some “must have” Mac OS X programs? What are some tools you use a lot to diagnose and fix Macs? I'll start the ball rolling Temperature Monitor ...
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1answer
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Isolating external hard drive failure?

I have a fairly new (~1.5 years old) external WD My Book with a bunch of audio projects that I'd like to recover. I'm wondering if there are any clever tricks I can try before pulling the disk out of ...